/**
 * @param {number[]} nums
 * @return {number[][]}
 */
 var findSubsequences = function(nums) {
    let res = [],path = [],cur
    backtracing(nums,0)

    function backtracing(nums,index){
      if(nums[]>){
        res.push(path)
        return
      }
      for(){
        path.push()
        backtracing(nums,index+1)
        path.pop()
      }
    }
};